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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79d5dd92b1c47fbcd429a743fe53d0528adf6585da319c2dc4fbd460e65c511d' 
  AND token = 'agwO7FT6upUVe5k7p1opLdafallZ3/Dx1djZb2lVW2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}